Electromagnetic apparatus for separating ores.



No. 639,062. Patented Dec. 12,1899;

E. KREUSER.

ELECTROMAGNET IG APPARAT US FUR SEPARATING DRES.

' A plication filed May 12, 1899.) (No Model.)

No. 639,062, Patented Dec. I2, 1899.

, axnaussn. Y ELECTROMAGNETIC APPARATUS FOR SEPABATING ORES.

(Apphcation filed May 12, 1899.)

(No Model.) Y 3 Sheets-Shet 2.

I4 5.- izja 3 Sheets-Sheet 3 Patented Dec. l2, I899.

E. KBEUSEB. ELECTROMAGNETIC APPARATUS FOR SEPARATING ORES.

I (Application filed May 12, 1899.)

THE NORRIS PETERS co, Morourua. WASHINGTON, u, c.

(No Model.)

llNrTnn STATES PATENT @FFICE,

EMIL KREUSER, OF MECI-IERNICH, GERMANY.

ELECTROMAGNETIC APPARATUS FOR SEPARATING ORES.

fiPECIFICATION forming part of Letters Patent No; 639,062, dated. December 12, 1899.

Original application filed February 28, 1899, Serial No. 707,212. Divided and this application filed May 12, 1899. Serial No.

716,608. (No model.)

T at whom/it may concern:

Be it known that I, EMIL KREUSER, retired director of Royal Mines, a citizen of Germany, residing at ,Mechernich, Rhine Province, Germany, have invented certain new and useful Improvements inElectromagnetic Apparatus for Separating Ores, (forwhich I have made application for a patent in Great Britain, dated February 8, 1899, No. 2,849,) of which the following is a specification.

This invention relates to a construction of electromagnetic ore-separators described in the specification 'to my application for a patent, filed February 28, 1899, Serial No. 707,212, in which two revolving bar electromagnets with polar surfaces of cylindrical form and having the wire coils wound on parts of reduced diameter situated between the poles are arranged with their polar surfaces of different polarity placed opposite each other. According to the present improvements such electromagnets are made with at least three polar surfaces, with intermediate wire coils so wound that by the electriccurrent passed through the same the two outer or end poles of the magnet receive the same polarity,while the middle or intermediate pole is of opposite polarity, the poles of the one magnet being, however, as before, of the opposite polarity to those of the other magnet which are presented to them, so that between the two is formed a series of fields of great intensity. A considerably-varied action of the magnets can be obtained with this arrangement by making the cylindrical poles of either one or both magnets of different diameters instead of making them of equal diameters, as heretofore. The diameters of the two outer poles can either be made smaller or larger than that of the middle pole. In the firstnamed case the intermediate poles of the electromagnets in being put in direct metallic contact with each other form a pair of contact-poles and do notserve for separating the ore, but for regulating the'polar distance between two outer pairs of poles which serve for the separation of the ore. The distance between these cylindrical polar surfaces will depend upon the relative proportion between their diameter and that of the pair of contactpoles. In the second above-named arrangement, in which the two outer poles of each magnet have a greater diameter than the intermediate poles, only the latter are employed for the separation of the ores, while the outer poles serve as pairs of contact-poles, which regulate the distance between the intermediate poles. The contact-poles also serve for transmitting the rotary motion which is imparted to the one electromagnet from the outside to the other one, as owing to the magnetic action the contact-poles attract and are consequently pressed strongly against each other, so that if the one magnet be rotated the resulting strong frictional contact will cause the second one to be carried aroundwith.

it. In both the above described arrangements the diameters of the two cylindrical poles that are opposite each other can be made different, so that by this means the two cylinder magnets can be made to revolve at different speeds. The distance between the poles that effect the ore separation can be varied in two different ways. On the one hand the contact-poles can be made variable in diameter by fitting upon them iron rings of different thicknesses, and on the other hand the contact-poles may have the form of conical frusta. In this latter case the dis tance between the ore-separating poles can be varied by shifting the magnets longitudinally relatively to each other.

The above-described arrangements for mak* ing some of the cylindrical poles serve as contact-poles, while the other or others serve as ore-separating poles, are not limited to a construction of magnets with three poles. The magnets can be constructed with an'ydesired number of such poles, pairs of which are made to serve either as contact-poles or as ore-separating poles. Also it is not necessary that both the cylinders should be provided with wire coils for rendering them magnetic, as one of them can be without winding and made to serve as a cylindrical armature, becoming more or less magnetic by the magnetic induction from the electromagnet.

The above-described improved construction offers the following advantages: With this arrangement special devices for regulating the distance apart of the ore-separating poles are rendered unnecessary, as such regulation is effected, as described, by the contact-poles. Furthermore, the magnetic resistance of the apparatus is much less than with existing constructions, as in place of two air-resistances there is in each magnetic circuit only one air-resistance to be overcome by the magnetic lines of force, inasmuch as at the contact-poles the transmission of the magnetic lines of force takes place directly from metal to metal.

In the accompanying drawings, illustrating my invention, Figure 1 is a detail side elevation of two cylindrical electromagnets with one pair of contactpoles embodying my invention. Figs. 2 to 9, inclusive, are similar views showing modifications or variations hereinafter explained in detail, and Fig. 10 is a side elevation of a magnetic ore-separator embodying my invention.

In Fig. 1, A and B are the middle or intermediate cylindrical poles which are of enlarged diameter, so as to serve as contactpoles, while D and E F are the two pairs of cylindrical poles, which serve as ore-separating poles. Gr, H, I, and K are the wire coils wound 011 the reduced intermediate parts of the magnets, to which the electric currents are supplied through the sliding contact-rings a, b, c, and d. The coils are wound in such manner that on the passage of electric currents through them, as indicated, for example, by the arrows, the outer poles O D are rendered of south polarity, while the intermediate poleA is rendered of north polarity, the outer pole E F being, on the other hand, rendered north, while Bis rendered south. The dotted lines indicate the circuit of the magnetic flux through the two magnets. Both magnets are revoluble upon their axes e g and f h, and on imparting rotary motion to the one magnet after they have been magnetized by the passage of a current such motion is transmitted to the second one by the strong frictional contact between the contact-poles A I produced by their magnetic attraction.

Fig. 2 shows the same construction as at Fig. 1, but wit-l1 the outer poles O D E F made to constitute the contact-poles, while the intermediate poles A B constitute the ore-separating poles.

Figs. 3 and 4 show two arrangements in which the opposite poles of the two magnets are of unequal diameters. In Fig. 3 the intermediate poles A B are the contact-poles, as at Fig. 1, A being smaller than B so that the upper magnet will revolve at a quicker speed than the lower one, which arrangement is of advantage in many cases. In Fig. 4 the outer poles are the contact-poles, as at Fig. 2,

those of the upper magnet C D being greater than E F, so that the lower magnet revolves faster than the upper one.

Fig. 5 shows a part elevation and part longitudinal section, and Fig. 6 an end view, of a modification in which the magnets are each provided with five poles, the two outer pairs being the contact-poles, while the three intermediate pairs are the ore separating poles.

The rings at n 0 p, fitted on the contactpoles, are also of soft iron and are arranged so that they can be changed for the purpose of varying the polar distance between the ore-separating poles, as above described.

Figs. 7 and'8 show two modifications of the second above-described arrangement for regulating the polar distance. In Fig. 7 the intermediate pair of poles A B are the contactpoles, these being made as conical frusta, so that on shifting the one magnet longitudinally relatively to the second one the polar distance will be either increased or decreased. In Fig. 8 the two outer pairs of poles are the contact-poles and are formed as conical frusta. Fig. 9 shows the above-described ar rangement, in which only the upper cylinder is provided with wire coils, so as to constitute an electromagnet, the lower one serving as armature and being only rendered magnetic by induction.

' Fig. 10 "shows an elevation of a magnetic ore-separator in which the cylindrical magnets are of the type shown in Fig. 7. The axes e g and fh revolve in bearings if and 7c Z, respectively fixed to the framing L. The sliding contact-rings a b c d are keyed to the axes on which they are mounted, respectively,

and are insulated therefrom,while the brushes q rst convey the current for exciting the magnets. The lower cylinder is revolved by means of the gearing P and drives the upper cylinder through the contact-poles A B of the magnets, such as are shown in Fig. 7.

Having thus particularly described and ascertained the nature of this invention and the best means I know for carrying the same into practical effect, I claim 1. In an electromagnetic ore-separator, a pair of cylindrical electromagnets having at least three cylindrical poles of larger diameter than the intermediate parts on which the wire coils are wound, the two end poles being of the same polarity while the intermediate pole is of opposite polarity, and one of the sets of poles being made of larger diameter than the other so that such larger poles of one magnet are in contact with those of the other, while the polar distance between the smaller poles constitutes the magnetic field for the separationof the ores, substantially as described.

2. In an electromagnetic ore-separator, the

combination of a pair of cylindrical electrot-ance between the other poles, substantially 1o magnets having at least three poles one or I as described.

more of the poles of the one magnet being in In testimony whereof I have hereunto set contact With one or more poles of the other my hand in presence of two subscribing witmagnet,whi1e the other poles have a space nesses.

between them which constitutes the magnetic EMIL KREUSER. field for the separation of the ores, and means Vitnesses: for varying the diameters of the poles that CHAS. E. BARNES,

are in oontact,in order to vary the polar dis- 1 WILLIAM H. MADDEN. 

